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Libraries contain masses of beautifully structured data collected over many years. But these records may have their flaws and might now want to be used in ways, such as location based services, that weren’t imagined 30 years ago. How can we use existing API’s and web services to enrich this data to enable it to be used in a variety of ways. This data also needs to be exposed for others to use and build upon. With the recent release of the Government response to the Web 2.0 taskforce, how can institutions comply with these recommendations by providing their data in usable forms for the public. What’s involved in building an API into our resources and how can our data be given more meaning through semantic linkages like RDFa?